Twenty six people were killed and 30 injured after a tourist bus caught fire in central China, local officials said.

The vehicle burst into flames as it drove through Hunan province Friday with 56 people on board -- including 53 passengers, two drivers and a tour guide -- according to local authorities.

The injured, including five in a critical condition, were rushed to hospital for treatment.

The two drivers were detained and an investigation into the cause of the accident is under way, according to a statement posted on the city of Changde's official social media account on Weibo.

The incident occurred at around 7:15 p.m. (1115 GMT) Friday along a stretch of Hanshou County in Changde.

Photos from the scene show the 59-seater bus's interior completely charred, possibly indicating the fire started with materials on board.

Grisly car accidents are common in China, where transport authorities struggle to enforce safety regulations, which are often flouted.

Some 58,000 people were killed in traffic accidents across the country in 2015, the latest year for which the data is available publicly.

Violations of traffic laws were blamed for nearly 90 percent of accidents that caused deaths or injuries that year.

In November, at least 13 people died when a bus plunged off a bridge in Chongqing municipality, after the driver got into a fist fight with a passenger who had missed her stop.

Search and rescue teams dispatched more than 70 boats, as well as a team of scuba divers and underwater robots, to find the wreckage and retrieve bodies from the water.

In February, a van packed with pressurized gas tanks and petrol-filled bottles caught fire and plowed into pedestrians in Shanghai, leaving at least 18 people injured.

Authorities concluded that it had been a "traffic accident."

Industrial and transport safety remain major problems in China, with at least 64 people now reported dead in a massive chemical explosion Thursday in the eastern province of Jiangsu.

Previous deadly incidents aboard buses in China, including arson attacks, have been determined to have been caused by passengers or drivers bearing grudges against their employers or society.